Acquisition (Details) $ in Thousands	3 Months Ended					6 Months Ended		12 Months Ended		18 Months Ended
	Jul. 03, 2016 USD ($)	Apr. 03, 2016 USD ($)	Jan. 03, 2016 USD ($)	Jun. 28, 2015 USD ($)	Sep. 28, 2014 USD ($)	Jul. 03, 2016 USD ($)	Jun. 28, 2015 USD ($)	Jan. 01, 2017	Jan. 03, 2016 USD ($)	Jul. 03, 2016 USD ($)
Business Acquisition [Line Items]
Right of First Refusal, Number of States	20					20				20
Number of Restaurants Acquired						18			55	73
Business acquisitions, purchase price						$ 19,207	$ 805		$ 52,750	$ 71,957
Business acquisitions, properties purchased						5			16	21
Proceeds from sale-leaseback transactions						$ 17,687	3,136
Business Acquisition, Number of Separate Transactions						2
Restaurant sales	$ 241,368			$ 219,102		$ 463,887	$ 412,272
Acquired Restaurants [Member]
Business Acquisition [Line Items]
Properties sold in sale-leaseback transactions						12			3
Proceeds from sale-leaseback transactions						$ 17,700			$ 4,300
Restaurant sales	$ 23,600					$ 42,300
March 31, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired				4
Business acquisitions, purchase price				$ 794
August 4, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired					5
Business acquisitions, purchase price					$ 663
October 1, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired			5
Business acquisitions, purchase price			$ 5,044
Business acquisitions, properties purchased			1
October 20, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired			1
Business acquisitions, purchase price			$ 709
November 17, 2015 Acquisition 1 [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired			2
Business acquisitions, purchase price			$ 618
November 17, 2015 Acquisition 2 [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired			6
Business acquisitions, purchase price			$ 10,945
Business acquisitions, properties purchased			5
December 1, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired			23
Business acquisitions, purchase price			$ 26,175
Business acquisitions, properties purchased			10
December 8, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired			9
Business acquisitions, purchase price			$ 7,802
February 23, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired		12
Business acquisitions, purchase price		$ 7,127
May 25, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Number of Restaurants Acquired	6
Business acquisitions, purchase price	$ 12,080
Business acquisitions, properties purchased	5
Subsequent Event [Member]
Business Acquisition [Line Items]
Properties sold in sale-leaseback transactions								5